https://gardeningsoul.com/23-insanely-clever-gardening-ideas-on-low-budget/
My three favorites:
Honestly, shoe organizers are great for organizing other things as well, such as crafting supplies, but this might really work and be great. You could hang it anywhere and move it as needed to get the right amount of sun.
This is pretty brilliant. It's always hard for me to get the soil in a bed all nice and perfectly level when planting seeds, this would take care of that, flattening an entire area equally.
The small albums are nice for a refined subject, and perfectly sized for this method of seed organization.